CHEM 120 EXAM

CHEM 120 Final Exam Practice Questions

1. Question: (TCO 12) The DNA double helix is _____. (Pts. : 5)
made up of two polynucleotide strands

composed of adenine and thymine

a puzzle to geneticists

composed of adenine and guanine

composed of two chromosomes


2. Question: (TCO 12) Which of the following best describes the action of enzymes in living systems?
A specific enzyme generally catalyzes (Pts. : 5)

one specific reaction.

a group of similar reactions.

many different reactions.

either one specific reaction or a group of similar reactions.

random reactions.


3. Question: (TCO 12) Which of the following is not an unsaturated fatty acid? (Pts. : 5)
CH3CH2CH2CH=CHCOOH

CH3CH=CHCH=CHCOOH

CH3CH2CH2CH2CH2COOH

CH3CH2CH2CH2CH2CH=CHCOOH

CH3CH=CHCH2CH=CHCOOH


4. Question: (TCO 12) The primary structure of a protein is determined by (Pts. : 5)
the amino-acid composition.

the order of amino acids in the protein.

the hydrogen bonding that gives the protein a three-dimensional shape.

the intertwining of protein molecules to form a “functional” protein.

the hydrogen bonds between sulfur atoms on different amino acids.


5. Question: (TCO 12) Which of the following is a disaccharide? (Pts. : 5)
Cellulose